Simultaneous transmission of telegraphic and telephonic impulses.



PATENTED JULY '23. 19077.

I. K'ITSEE. v SIMULTANBOUS TRANSMISSION OF TBLEGRAPHIG AND TELEPHONIG IMPULSES. APPLIQATION FILED SEPT. 22,1906.

Enuan m MM/Mamas onTTsn STATES PATENT oTTron.

ISIDOR KITSEE, or PHILADELPHlA, PENNSYLVANIA.

- Specification of Letters Patent.

Patented July 23, 1907.

Application filed September22,1906. Serial No. 335,780.

To all whom it may concern:

Be it known that I, Isrno'n KrrsnE, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and Statecf Pennsylvania, have inventedcertain new and useful Improvements in Simultaneous- Transmission of Telegraphic and Telephonic- Impulses, of which the following is a specification. I

My invention relates to an improvement in the'simultaneous transmission of telegraphic and telephonic I impulses. Its object is, to decrease or entirely-eliminate -the influence of telegraphic impulses on telephonic receivers. g

When telegraphing is done with the aid of a straight current, it is comparativelyeasy to lessen the influence of a telegraphic impulse on the telephonic receiver, for the reason thata path maybe established for the telephonic impulses, opaque or nearly so to the impulses due. to the make and break of a straight or direct current. For such purpose different arrangements have been devised and are more or less successful But when the telegraphic impulses are due to induced currents, that is, when the secondary impulses of an inductoriuni are sent over a line, the same are retarded by the impedance coils just as well as the telephonic impulses, and static incanssuch as condensers-a-rc just as transparent to the flow of such impulses as to the flow of telephonic impulses. Such arrangements, therefore, as shunting the telephonic receiver with condensers, or trying to side-track, so to speak, the telegraphic induced impuises with the aid of coils opaque to telephonic impulses is out of the question.

In my endeavor to telegraph with induced impulses,in1pulses generated in the secondary of an inductoriuin through the make and break of a circuit including the primary of said inductorium,and to simultaneously transmit over one and the .same line telephonic impulses, l have tried above arrangements but with no avail. All branch circuits opaque to the induced telegraphic impulses were found to he opaque in the lclvplmni impulses and vice vcrsu. All brunch virruils xmuspart-m to the telephonic impulses et also luuml in be transparent to the induced telec ndenser represented a capacity of about five microl'nunls. The line I made these experiments on was somewhat more than forty four miles in length, and I tried these experiments by, first producing anallmetallic line; secondly, producing a one-conductor line grounded; and thirdly, producing, what I call, a composite line, that is, a line consisting of two conductors insulated from each other but in inductive relation to each other, one conductor grounded with one terminal, the other terminal being free, and the second conductor grounded with the opposite terminal, leaving its other terminal free.

In my tests which gave satisfactory results, I used as a telegraphic transmitting device an iuductorium, an ordinary Morse transmitting key and a source of current equal to about three volts. The secondary-of the inductorium was connected in series as to the line and was providedwith means to vary its resistance from six ohms to somewhat over two hundred ohms. The

primary had a resistance of about three-fourths of an.

ohm. The receiving deviqe consisted of a polarized relay with a combined resistance of the coils equal to about fifteen hundred ohms. The coils were wound with No. 36 silk covered wire. The telephonic transmitter consisted of the usual desk phone, an induct-orium, the primary with about three fourths of an ohm and the secondary provided with means to vary its resistance from six ohms to two hundred ohms. The force used was about one volt more than the force used with the telegraphic transmitting device. The telephonic receiver was a common car-phone. The line, as said above, had a lineal length of nearly forty five miles. The best results were obtained when the different coils of the secondary of the telegraphic transmitter were connected in multiple, so as to give a combined resistance of twelve ohms.

It has to be stated here, that the telephonic receiver was not connected directlytothe line, but with the interposition of an inductorium, the secondary of which was connected to the line and the primary therefor to the receiver proper. The secondary of this inductorium, presented a resistance of about six ohms.

Referring to the drawing, Figures 1, 2 and 3 are diagrammatic views of different circuits including telegraphic and telephonic devices and embodying my invention. Fig. 1 is a one-conductor line grounded on both ends; Fig. 2 is a composite line consisting of two conductors, each grounded with one terminal; Fig. 3 is a composite line comprising two composite conductors, each consisting of two conductors in inductive relation to each other; all four conductors iorming two open circuits.

in Fig. 1, 1 is the line of transmission; 20 are the grounds for same; is the telegraphic transmitting device as an entirety; of this 10 is the inductorium used as a telegraphic transmitter. Of this inductorium, 11 is the secondary connected in the line and provided with means 12 toyary its inductive value. 13 is the condenser shunting the secondary; 14' is the primary;

15 the key; and 16 the source of current, here shown as two batteries. 30 is the telephonic transmitting device? as an entirety, comprising-as usua1-the inductorium 31, the micro-phonic transmitter 32 ancl'sourceoi cur rent 33. 40 is a telegraphic receiving device, here shown as a polarized relay; 50 is the telephonic receiving device, as an entirety, co'mprisingthe secondary 51,

the primary 52 ofan inductoriuin and theear-phone 53.

In Fig. 2, the line of transmission consists of the two conductors 1. and 2 insulated from each other; but in inductive relation to each other These conductors are grounded. at 20. 1" I In Fig. 3, the line comprises two conducting fpairs,

one conducting pair comprising the conductorsi and f2,

and the other conducting' pair comprisingtheponductors3anti4. I I I have. shown and described-herein subject-matter not claimed, but claimed in my (to-pending application Serial No. 338,415," filed October 11,1906.

Baving now described my invention, what I claim as new and desire to secure by Letters Patent is:'

1. In a system of electric signaling over a conductor or circuit; the combination with a conductor or circuit, 01

-means for generating a sharp current impulse, and astorage device'of relatively great storage capacitysubject'ed to said impulse, whereby the current flowing over theconductor or ,circuit assumes the form of an impulseof relatively great duration.

i 2. In a system of electric signaling over a conductoror circuit, the combination with a'conductor or circuit, of

means for producing a sharp electrical impulse, and a condenser of relatively greatcapacityhuhjected to saidim pulse, whereby the current flowing over the conductor or circuit assumes the form of an impulse of relatively great duration. i V 3. In a system of electric signaling over a conductor or circuit, the combination-with aconductor or circuit j uf a secondary of a transforineig l neans for generating in said transformer secondary a shilrp impulse,'anda condenser of relatively highv capacity associated with said transformer secondary and said conductor or circuit, whereby the current ilowingoverisaid con'ductor'or' circuit assumes the form of an'impuise of-relatively greatdurationl 4. In a system o electric signaling overs. conductor ,0! circuit; the combination with a conductor or circuit of nieans' for producing a sharp electrical impulseya condensenof relatively great capacity, and'means' for impressing said impulse simultaneously, upon said circuit or conductor and said condenser,.whereby the current'flowing over'said, circuit or conductor assumes the form ot-an in)- pulse of relatively great duration. I

f 5. Ina signaling system, a. composite line conductor comprising conductively. independent conductors twisted --tog 'ether, and an associated transmitter comprisingmeans for generating a sharp electrical impulse, and a condenser of relatively greatfcapacity s uhject'ed ito said impulse, 

